luttropp



Dec. 1, 1925- 1,563,763

C. LUTTROPP CALCULATING MACHINE Original Filed Aug. 13 19 2 Sheets-Sheet 1 fig. 5.

z/zuzau 2725293433 Fig.5- 25 H F1 F1 Dec. 1, 1925 C. LUTTROPP CALCULATING MACHINE Original Filed Aug. 13 1923 2 Sheets-Sheet 2 Patented Dec. 1, 1925.

UNITED STATES PATENT OFFICE.

CONRAD LUTTBOPP, OF STOCKHOLIVI, SWEDEN, ASSIGNOR OF ONE-HALF TO ANDERS LINDAHL, 0F STOCKHOLM, SWEDEN.

CALCULATING MACHINE.

To all whom itmag concern Be it known that I, CONRAD LUTTROPP, a citizen of the Kingdom of Sweden, residing at Stockholm, Sweden, have'invented new and useful Improvements in Calculating Machines, of which the following is a specification and is a division of my application Serial No. 657,148.

This invention relates to calculating machines and more especially to an improved tens transfer mechanism for counting machines for addition and subtraction as well as for multiplication and division.

The object of the invention is to provide a tens t'ansfer mechanism which operates satisfactorily independently of the number of numeral wheels in the counting register to which it is applied.

The invention consists chiefly in the combination with the counting register of a calculating machine of a tens transfer mechanism, comprising two shafts having series of projections and adapted to be rotated in opposite directions, pinions engaging constantly the numeral wheels in said counting register, and a carrier for each of said pinions, adapted to be shifted from a midd-le position into an operative position in relation to either of'said shafts by action from an adjacent numeral wheel.

In the accompanying drawings, I have shown one embodiment of my invention. Fig. 1 shows a longitudinal section of a calculating machine in which the improved tens transfer mechanism is provided. Fig. 2 is a plan of the'tcns transfer mechanism and its driving mechanism. Fig. 3 is a side view of the driving sector and its catch mechanism. Fig. 4 shows a section of the driving sector on the line (0-4 in Fig. 3. Fig. 5 is a side view of the means shown in Fig. 2. Figs. 6 and 7 show side views of the tens transferring means "in different positions. Fig. 8 shows a detail view of two cam shafts forming parts of the tens transfer mechanism.

Referring now to the drawings, A is a carriage on which the main counting register of the machine is provided in usual manner. The handle shaft 1 carries a toothed sector 2 engaging a toothed wheel 3 on an inter mediate shaft at. The toothed wheel 3 engages another toothed wheel 5 on a shaft 6 journalled in parallel to the shaft 4. The

Divided and this application filed April 22,

toothed wheels 3 and at are rotatably mounted on the shafts 4 and 6 respectively and connected to'them by means of ratchet gears in such manner that the shaft 4 when the sector 2 is rotated in one direction is rotated one revolution in which the calculating operation excepting the tens transfer is adapted to be carried out, while the shaft 6 on rotating the sector 2 in opposite direction is rotated one revolution in which the tens transfer is adapted to take place. The counting wheels 8 of the main counting register are in performing a calculating operation operated from the intermediate shaft l by means of devices controlled by the keys of a key board. Said devices may be of any suitable kind and need therefore not he described here in detail.

Each numeral wheel 8 of the main connt ing register has a pin 9 adapted to rotate a lever 10 from a middle position (Fig. in either direction (Figs. 6 and 7 when the numeral 9 is exceeded in adding or the numeral 0 is exceeded in subtracting. Said levers 10 are journalled onpins 11 secured to the right side of cross plates 12 (Fig. 2) which separate the numeral wheels 8. Each lever 10 is provided with a catch 14 actuated upon by a spring 13 and journalled on a longitudinal shaft 15 in the carriage. Said catch has three notches 16, 17 and 18 adapted to lock the lever 10 in normal position (Fig. 5), in position for tens transfer in adding (Fig. 7), and in position for tens transfer in subtracting (Fig. 6) respectively. On the opposite side of the cross plate 12 in relation to the corresponding lever 10 a swinging iarrier 19- is provided, said carrier being journalled on the shaft 15 and carrying at. its front end a pinion 21 journalled on a pin 20. Said pinion 21 is always in engagement with the toothed portion 22 of the numeral wheel 8 which lies on the left side of the cross plate 12 in question, independently of the position of the carrier 19. The carrier 19 is provided with a pin 23 which freely passes through an opening in the cross plate 12 and engages an opening in the lever 10 so'that the carrier is turned upwards when the lever 10 is acted upon by the pin 9 ofthe numeral wheel 8 placed to the right of the cross-plate, when" adjustment for tens transfer in adding takes place (Fi 7 while the carrier 19 is turned downwards when adjustment for tens transfer takes place in subtracting (F1 6). To

act upon the pinion 21 and thus the numeral wheel 8 placed to the left of the cross plate 12 when the corresponding lever carrier 19 have been adjusted for tens transfer by the action of the pin 9 of the numeral wheel 8 placed to the right of the cross plate 12 two longitudinal shafts 2 and adjustment for tens transfer in adding has taken place as shown in Fig. 7, the pinion 21 is in the path of the corresponding projection 26 of the shaft 24 so that when-the shaft 24 rotates said pinion is acted upon by the projection 26 so far that the corresponding v numeral wheel is advanced one numeral distance. If,on the contrary, adjustment for tens transfer in subtracting has taken place, as is shown in Fig. 6, the pinion 21 is in the path of the corresponding projection 27 of the shaft 25 so that on the rotation of the latter which takes place in the opposite direction to the rotation. of the shaft 24, the pinion 21 is acted upon by the projection 27 so far thatthe numeral wheel 8 is rotated backwards one numeral distance. To effect a successive tens transfer from the right to the left the projections 26 and 27 are provided on a helical line on the shafts 24 and 25 respectively.

The shafts 24 and 25 are connected tr. each other by toothed wheels 28, 29 so that. they are caused to rotate in opposite directions and obtain their movement by gearing from the handle of the machine. Said gearing comprises a pinion 30 secured to the shaft 6 and coupled by means of other pinions 31, 32 to a toothed drum 33 the length of which corresponds to the motion of the carriage and. which is engaged by a pinion 34 on the carriage, the shaft of said pinion being coupled to the shaft '25 by means of pinions 35, 36. In the embodiment shown the gear ratio from the shaft 1 to the shafts 24, 25 is so selected that said shafts are rotated through two revolutions during the return of the handle to normal position. By increasing the gear ratio the said shafts an be rotated more than two revolutions and thus effect the tens transferring operations any desired of numeral wheels while a sufficient angular difference between the successive projections of the shafts 2%, 25 is maintained in order to permit a successive tens transfer.

The return of the carrier 19- and the lever 10 to the normal position is effected inn mediately after the performance of the tens transferring operation, the projection 26 or 27 of the shaft 2% or 25 hitting a projection 37 or 38 of the carrier and turning the latter to the middle position, the lever 19 being simultaneously carried therewith by the pin .23.

VVhat I claim 1. Tens transfer mechanism for calculating machines, comprising two shafts having series of projections and adapted to be retated in opposite directions, pinion's adapted constantly to engage numeral wheels of a counting register, a carrier for each of said pinions adapted to be shifted from a middle position into an operative position to either of said shafts by an operation from the numeral wheels.

2. A calculating machine, comprising a carriage, a counting register in said carriage containing a plurality of numeral wheels, two shafts in said carriage having series ofprojections and adapted to be retated in opposite directions, pinions constantly engaging said numeral wheel's, a swingable carrier for each of said pinions adapted to be shifted from avmiddle position into an operative position in relation to either of said shafts by an action from an adjacent numeral wheel.

3. A calculating machine, comprising a counting register containin a plurality of numeral wheels, two shaft having series of projections and adapted to be rotated in opposite directions, pinions constantly on gaging said numeral wheels, a swingable carrier for each of said pinions, a' lever engaging said carrier and adapted to shift said carrier so as to bring the corresponding pinion into operative position in relation tocither of said shafts, and projections on said carriers adapted to be acted upon by the projections of either shaft for returning the carrier into normal position.

In testimony whereof I have signed my name.

CUNRAD LUTTR'OPP. 

